Outdoor unit will not run

Its 22 F outside I have a outdoor Infinity that will not run .The indoor is fine Its a fish store with lotsa great stuff but need cooling 'Its a 4 ton unit its been fine when temps are 28 to 32 help or I'll be eating lots

Running an air conditioner in the winter.
Generally they have a low pressure switch on them that won't allow it to run when the pressure falls below about 60 psig, at 22° F refrigerant R22 pressure is about 45 psig.
So to run it at that temperature you will have to disconnect your low pressure switch and install a jumper wire across those terminals and install a low ambient fan cycling switch kit (that you can get at your local ac parts house) which will keep the head pressure up when unit is running.
But by bypassing the low pressure switch you won't have any protection if you have a refrigerant leak or your indoor blower fails
or filter or evaporator gets dirty or plugged up.

Some air conditioners have a thermostat that will not allow the compressor to run below a certain out side tempature as it will cause liquit to come back into the compressor(called slugging) and damage or destroy it.

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The proper size is dictated by the connection points on the inside unit. Measure the two refrigerant lines and run that sizes to your outside unit. This piping needs no adjustment for 5 meters (a little less than 20 feet).

According to instructions for similar systems, you have to replace batteries in the outdoor unit first, then the indoor unit and wait 10 minutes without pressing any buttons for the indoor unit to begin displaying the outdoor temperature.

Are you saying you have two HVAC systems or one? If you have two indoor units, you must have two outdoor units. Which outdoor unit is running. You said it is running hot. Assume the fan in running to cool the condenser. If so it should be about 20 degrees warmer than outdoor air. If not maybe you have a dirty condenser coil. Need more information.

Try pushing the red reset button at the outdoor unit near the brass service valves (where the refrigerant lines enter the outdoor unit). Also check for power from circuit breakers furnishing power to the outdoor unit ( the indoor unit has a seperate power supply source ). There may be fuses in the service disconnect box mounted near your outdoor unit. If those "blow" they will prevent operation of your outdoor unit. You can test continuity using an ohmmeter. If you do not have an ohmmeter, you can take the fuses to the local hardware store. They should be able to test them for you and offer replacements if needed. If after doing all these steps you continue to have problems, let us know and we will dig a little deeper. :-)

The blinking light is because the unit is waiting for the outdoor unit to come on. If in heating mode, the indoor fan will not run before enough pressure and therefore heat has built up. You should check that the indoor air return sensor is not faulty and therefore preventing the outdoor unit from coming on.

On the outdoor unit the fan should not be running, on the indoor unit the fan should be running. If you then check the outdoor unit with fan not running, you should be able to hear clearly that the compressor is actually working. If this is all correct, it is possible that your fourway reverse valve is seeping and needs to be replaced.

You have not said what model this is for. But as a rule, you have indoor to outdoor wiring, if you open the indoor unit they are labelled 1,2,3,4,5. The indoor wiring must correspond to the outdoor unit. So whatever is wired to 1 indoor must be same on outdoor.

Depending on the age of the unit it could be several things, does it have a circuit board? Contactor could be bad, freon leak if it has a low pressure switch, burnt wires, connections, etc. Do a complete visual and check for 24 volts, does the indoor unit run? Transformer may be bad.... No indoor unit - no outdoor unit, most of the time the outdoor unit gets its 24 vac power from the indoor unit which runs them both, look for fuses (like car fuses)..